/**************************************************************************//**
 * @file     wm_i2c_demo.c
 * @version
 * @date
 * @author
 * @note
 * Copyright (c) 2014 Winner Microelectronics Co., Ltd. All rights reserved.
 *****************************************************************************/
#include "wm_include.h"
#include "wm_i2c.h"
#include <string.h>
#include "wm_gpio_afsel.h"

#if DEMO_I2C

#define I2C_FREQ		(200000)

/**
 * @brief	read one byte from the specified address of the eeprom
 * @param addr the eeprom address will be read from
 * @retval     the read data
 */
u8 AT24CXX_ReadOneByte(u16 addr)
{
    u8 temp = 0;
    //printf("\nread addr=%x\n",ReadAddr);
    tls_i2c_write_byte(0xA0, 1);
    tls_i2c_wait_ack();
    tls_i2c_write_byte(addr, 0);
    tls_i2c_wait_ack();

    tls_i2c_write_byte(0xA1, 1);
    tls_i2c_wait_ack();
    temp = tls_i2c_read_byte(0, 1);
    //printf("\nread byte=%x\n",temp);
    return temp;
}

/**
 * @brief	read multibytes from the specified address of the eeprom
 * @param[in] addr the eeprom address will be read from
 * @param[in] buf 	Pointer to data buffer
 * @param[in] len	amount of data to be read
 * @retval    null
 */
void AT24CXX_ReadLenByte(u16 addr, u8 *buf, u16 len)
{
    //printf("\nread len addr=%x\n",ReadAddr);
    tls_i2c_write_byte(0xA0, 1);
    tls_i2c_wait_ack();
    tls_i2c_write_byte(addr, 0);
    tls_i2c_wait_ack();
    tls_i2c_write_byte(0xA1, 1);
    tls_i2c_wait_ack();
    while(len > 1)
    {
        *buf++ = tls_i2c_read_byte(1, 0);
        //printf("\nread byte=%x\n",*(pBuffer - 1));
        len --;
    }
    *buf = tls_i2c_read_byte(0, 1);
}

/**
 * @brief	write one byte to the specified address of the eeprom
 * @param addr the eeprom address will be write to
 * @retval     null
 */
void AT24CXX_WriteOneByte(u16 addr, u8 data)
{
    tls_i2c_write_byte(0XA0, 1);
    tls_i2c_wait_ack();
    tls_i2c_write_byte(addr, 0);
    tls_i2c_wait_ack();
    tls_i2c_write_byte(data, 0);
    tls_i2c_wait_ack();
    tls_i2c_stop();
    tls_os_time_delay(1);
}

/**
 * @brief	check the eeprom is normal or not
 * @retval
 *     0---success
 *     1---failed
 * @note
 *	different 24Cxx chip will use the different addr
 */
u8 AT24CXX_Check(void)
{
    u8 temp;
    temp = AT24CXX_ReadOneByte(255);
    if (temp == 0x55)return 0;
    else
    {
        AT24CXX_WriteOneByte(255, 0x55);
        tls_os_time_delay(1);
        temp = AT24CXX_ReadOneByte(255);
        if (temp == 0x55)return 0;
    }

    return 1;
}

/**
 * @brief	read multibytes from the specified address of the eeprom
 * @param[in] addr the eeprom address will be read from
 * @param[in] buf 	Pointer to data buffer
 * @param[in] len	amount of data to be read
 * @retval    null
 */
void AT24CXX_Read(u16 addr, u8 *buf, u16 len)
{
    while(len)
    {
        *buf++ = AT24CXX_ReadOneByte(addr++);
        len--;
    }
}

/**
 * @brief	write multibytes from the specified address of the eeprom
 * @param[in] addr the eeprom address will be read from
 * @param[in] buf 	Pointer to data buffer
 * @param[in] len	amount of data to be write
 * @retval    null
 */
void AT24CXX_Write(u16 addr, u8 *buf, u16 len)
{
    while(len--)
    {
        AT24CXX_WriteOneByte(addr, *buf);
        addr++;
        buf++;
    }
}

int i2c_demo(char *buf)
{
    u8 testbuf[] = {"AT24CXX I2C TEST OK"};
    u8 datatmp[32];

    wm_i2c_scl_config(WM_IO_PB_11);
    wm_i2c_sda_config(WM_IO_PB_12);

    tls_i2c_init(I2C_FREQ);

    while(AT24CXX_Check())
    {
        printf("\nAT24CXX check faild\n");
    }
    tls_os_time_delay(1);
    printf("\nAT24CXX check success\n");

    AT24CXX_Write(0, (u8 *)testbuf, sizeof(testbuf));
    tls_os_time_delay(1);
    memset(datatmp, 0, sizeof(datatmp));
    //AT24CXX_Read(0,datatmp,sizeof(testbuf));
    AT24CXX_ReadLenByte(0, (u8 *)datatmp, sizeof(testbuf));
    printf("\nread data is:%s\n", datatmp);

    return WM_SUCCESS;
}

#endif

/*** (C) COPYRIGHT 2014 Winner Microelectronics Co., Ltd. ***/
